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GRIA Gene Expression in Schizophrenia: A Participant-Level Meta-Analysis.

Adan Baumel¹, Assif Yitzhaky², Libi Hertzberg^1,2,3

¹School of Medicine, Faculty of Medical and Health Sciences, Tel Aviv University, 6997801 Tel Aviv, Israel.

Alpha Psychiatry

|July 8, 2026

Summary

Schizophrenia involves reduced expression of AMPA receptor genes (GRIA1-4) in postmortem brains and organoids, suggesting glutamatergic dysfunction in a patient subgroup.

Keywords:

AMPA gene expression profiling glutamate organoids receptors schizophrenia

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Area of Science:

Neuroscience
Genetics
Psychiatry

Background:

Schizophrenia is a complex disorder with high heritability but unclear pathophysiology.
Alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) glutamate receptors (GRIA1-4) are implicated but findings are inconsistent.
This study investigates GRIA1-4 gene expression in schizophrenia using diverse data.

Purpose of the Study:

To systematically evaluate differential expression of GRIA1-4 genes in schizophrenia.
To integrate transcriptomic data from postmortem brain tissue and cerebral organoids.
To clarify the role of AMPA receptors in schizophrenia pathophysiology.

Main Methods:

Participant-level meta-analysis of seven postmortem brain sample datasets (n=295).
Analysis of an independent patient-derived cerebral organoid dataset (n=16).
Quantification of expression differences using Hedges' g and assessment of heterogeneity with I² statistic.

Main Results:

Significant downregulation of all four GRIA genes (GRIA1-4) in postmortem schizophrenia brain tissue.
Downregulation was concentrated in a subgroup of patients, with no significant heterogeneity across brain regions or platforms.
Consistent downregulation of GRIA1-3 observed in cerebral organoids, modeling neurodevelopmental stages.

Conclusions:

AMPA receptor dysfunction may contribute to schizophrenia pathophysiology in a subset of patients.
Convergent evidence from postmortem and organoid data highlights GRIA genes as potential biomarkers and therapeutic targets.
Findings may inform personalized treatments for glutamatergic dysfunction in schizophrenia.